perf: Fix all 7 code analysis issues

HIGH (Performance):
- Replace 8 sync file operations with aiofiles in async context (storage, mail,
  report_generator, dms_bridge, ai_assistant)
- Frontend bundle splitting: manualChunks for react-vendor, ui-components, tanstack,
  markdown, icons, utils, i18n (ui chunk 936K → ~19K)

MEDIUM (Architecture):
- Worker circular deps: Replace direct plugin imports with job_registry.py pattern
  (register_job/get_all_jobs, importlib-based lazy loading)
- App-wide ErrorBoundary: New ErrorBoundary.tsx component, wrapped in AppShell
  and all standalone routes

LOW (Code Quality):
- N+1 query fix: selectinload(Contact.contact_persons) in list_contacts()
- O(n²) dedup fix: SQL GROUP BY for email/phone duplicates, Dict-based name grouping
- Response format standardization: 7 routes converted from plain arrays to
  {items: [...], total: N} format

app/plugins/builtins/ai_assistant/routes.py

@@ -6,6 +6,7 @@ from __future__ import annotations
 
 import uuid
 
+import aiofiles
 from fastapi import APIRouter, Depends, HTTPException, Query, UploadFile
 from fastapi.responses import FileResponse, StreamingResponse
 from sqlalchemy import select
@@ -407,7 +408,8 @@ async def list_tools(
     current_user: dict = Depends(get_current_user),
 ):
     registry = get_tool_registry()
-    return registry.list_for_api()
+    items = registry.list_for_api()
+    return {"items": items, "total": len(items)}
 
 
 # ─── Chat Sessions ───
@@ -717,8 +719,8 @@ async def upload_attachment(
     file_id = str(uuid.uuid4())
     safe_filename = file.filename or "unnamed"
     storage_path = str(ATTACHMENT_DIR / f"{file_id}_{safe_filename}")
-    with open(storage_path, "wb") as f:
-        f.write(content)
+    async with aiofiles.open(storage_path, "wb") as f:
+        await f.write(content)
 
     attachment = AIChatAttachment(
         session_id=session.id,

app/plugins/builtins/ai_assistant/services.py

@@ -12,6 +12,8 @@ import logging
 import uuid
 from typing import Any, AsyncGenerator
 
+import aiofiles
+
 import litellm
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -380,8 +382,8 @@ async def _extract_attachment_content(
     parts: list[str] = []
     for att in attachments:
         try:
-            with open(att.storage_path, "rb") as f:
-                content = f.read()
+            async with aiofiles.open(att.storage_path, "rb") as f:
+                content = await f.read()
 
             text_content = ""
             mime = att.mime_type.lower()

app/plugins/builtins/ai_proactive/jobs.py

@@ -416,3 +416,9 @@ async def heartbeat(ctx: dict[str, Any], user_id: str, tenant_id: str) -> None:
 
     except Exception:
         logger.exception("heartbeat: error posting status message")
+
+
+# Register all job functions with the job registry
+from app.core.job_registry import register_job
+
+register_job("deep_analysis", deep_analysis)

app/plugins/builtins/automation/agent_runner.py

@@ -268,4 +268,10 @@ async def run_agent(
         logger.exception("Failed to save AgentRun for %s", agent.id)
         result_data["save_error"] = str(e)
 
-    return result_data
+    return result_data
+
+
+# Register all job functions with the job registry
+from app.core.job_registry import register_job
+
+register_job("run_agent", run_agent)

app/plugins/builtins/automation/execution_engine.py

@@ -277,3 +277,9 @@ async def run_automation(
         result_data["save_error"] = str(e)
 
     return result_data
+
+
+# Register all job functions with the job registry
+from app.core.job_registry import register_job
+
+register_job("run_automation", run_automation)

app/plugins/builtins/automation/routes.py

@@ -181,7 +181,8 @@ async def list_miniapps(
     """List custom MiniApps from plugin config."""
     from app.plugins.builtins.kommunikation.miniapp_registry import MiniAppRegistry
     registry = MiniAppRegistry()
-    return registry.list_apps()
+    items = registry.list_apps()
+    return {"items": items, "total": len(items)}
 
 
 @router.post(

app/plugins/builtins/automation/scheduler.py

@@ -71,3 +71,9 @@ async def scheduler_tick(ctx: dict[str, Any]) -> None:
 
         except Exception:
             logger.exception("Failed to process cron job %s", job.id)
+
+
+# Register all job functions with the job registry
+from app.core.job_registry import register_job
+
+register_job("scheduler_tick", scheduler_tick)

app/plugins/builtins/automation/workflow_timeout.py

@@ -80,3 +80,9 @@ async def check_workflow_timeouts(ctx: dict[str, Any]) -> None:
 
         except Exception:
             logger.exception("Failed to process timeout for instance %s", inst.id)
+
+
+# Register all job functions with the job registry
+from app.core.job_registry import register_job
+
+register_job("check_workflow_timeouts", check_workflow_timeouts)

app/plugins/builtins/dms/routes.py

@@ -998,7 +998,7 @@ async def shared_with_me(
     file_ids = {p.file_id for p in perms}
 
     if not file_ids:
-        return []
+        return {"items": [], "total": 0}
 
     file_result = await db.execute(
         select(DmsFile).where(

app/plugins/builtins/kommunikation/dms_bridge.py

@@ -7,6 +7,8 @@ import os
 import uuid
 from typing import Any
 
+import aiofiles
+
 from fastapi import UploadFile
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -117,8 +119,8 @@ class DmsBridge:
             f"{file_id}{file_ext}",
         )
         os.makedirs(os.path.dirname(storage_path), exist_ok=True)
-        with open(storage_path, "wb") as f:
-            f.write(content)
+        async with aiofiles.open(storage_path, "wb") as f:
+            await f.write(content)
 
         # Create DMS file record
         dms_file = DmsFile(

app/plugins/builtins/mail/routes.py

@@ -884,7 +884,8 @@ async def list_threads(
             threads[tid] = {"thread_id": tid, "subject": mail.subject, "mail_count": 0, "mails": []}
         threads[tid]["mail_count"] += 1
         threads[tid]["mails"].append(mail_to_response(mail))
-    return list(threads.values())
+    items = list(threads.values())
+    return {"items": items, "total": len(items)}
 
 
 # ─── Templates (F-MAIL-06) ───

app/plugins/builtins/mail/services.py

@@ -1531,8 +1531,8 @@ async def send_mail_via_smtp(
         mime_type = att_info.get("mime_type", "application/octet-stream")
         if not file_path or not os.path.exists(file_path):
             continue
-        with open(file_path, "rb") as f:  # noqa: ASYNC230
-            content = f.read()
+        async with aiofiles.open(file_path, "rb") as f:
+            content = await f.read()
         # Determine maintype/subtype from mime_type
         if "/" in mime_type:
             maintype, subtype = mime_type.split("/", 1)

app/plugins/builtins/report_generator/routes.py

@@ -8,6 +8,8 @@ import json
 import os
 import uuid
 
+import aiofiles
+
 from fastapi import APIRouter, Depends, HTTPException, status
 from fastapi.responses import StreamingResponse
 from sqlalchemy import select
@@ -122,15 +124,15 @@ def _generate_json(rendered: str) -> dict:
         return {"result": rendered}
 
 
-def _save_report_file(
+async def _save_report_file(
     tenant_id: uuid.UUID, report_id: uuid.UUID, ext: str, data: bytes
 ) -> str:
     """Save report data to disk and return the path."""
     dir_path = os.path.join(REPORT_STORAGE_BASE, str(tenant_id))
     os.makedirs(dir_path, exist_ok=True)
     file_path = os.path.join(dir_path, f"{report_id}.{ext}")
-    with open(file_path, "wb") as f:
-        f.write(data)
+    async with aiofiles.open(file_path, "wb") as f:
+        await f.write(data)
     return file_path
 
 
@@ -142,7 +144,8 @@ async def list_presets(
     current_user: dict = Depends(require_permission("reports:read")),
 ):
     """List all available preset report templates."""
-    return get_preset_list()
+    items = get_preset_list()
+    return {"items": items, "total": len(items)}
 
 
 @router.post("/presets/generate")
@@ -468,10 +471,10 @@ async def download_report(
     media_type = media_types.get(ext, "application/octet-stream")
     filename = f"report_{report.id}.{ext}"
 
-    def _iter_file():
-        with open(report.output_path, "rb") as f:  # type: ignore[arg-type]
+    async def _iter_file():
+        async with aiofiles.open(report.output_path, "rb") as f:  # type: ignore[arg-type]
             while True:
-                chunk = f.read(65536)
+                chunk = await f.read(65536)
                 if not chunk:
                     break
                 yield chunk

app/plugins/builtins/tasks/jobs.py

@@ -59,3 +59,9 @@ async def tasks_due_reminder(ctx: dict) -> None:
         if total_notified > 0:
             logger.info(f"Tasks reminder: sent {total_notified} notifications")
         await db.commit()
+
+
+# Register all job functions with the job registry
+from app.core.job_registry import register_job
+
+register_job("tasks_due_reminder", tasks_due_reminder)

app/plugins/builtins/unified_search/jobs.py

@@ -249,3 +249,14 @@ async def embedding_batch(ctx: dict[str, Any]) -> None:
                     pass
 
     logger.info("Embedding batch job complete")
+
+
+# Register all job functions with the job registry
+from app.core.job_registry import register_job
+
+register_job("index_mails", index_mails)
+register_job("index_file", index_file)
+register_job("index_contact", index_contact)
+register_job("index_event", index_event)
+register_job("reindex", reindex)
+register_job("embedding_batch", embedding_batch)